Abstract: The positive electrode active material disclosed here includes: first lithium composite oxide particles in the form of single particles; and second lithium composite oxide particles in the form of secondary particles. When in a volume-based particle size distribution obtained by a laser diffraction scattering method, a 10%-particle size (D10) is a particle size with a cumulative frequency of 10%, a 50%-particle size (D50) is a particle size with a cumulative frequency of 50%, and a 90%-particle size (D90) is a particle size with a cumulative frequency of 90%, a 50%-particle size of the second lithium composite oxide particles is larger than that of the first lithium composite oxide particles, and a particle size distribution width of the second lithium composite oxide particles expressed by (D90-D10)/D50 is 0.50 to 0.65.

Abstract: Provided is a positive electrode active material that can increase a volume capacity density of a positive electrode of a nonaqueous battery secondary battery and can provide the nonaqueous electrolyte secondary battery with high cycle characteristics. A positive electrode active material disclosed here includes monoparticulate first lithium composite oxide particles and secondary particulate second lithium composite oxide particles. An average particle size of the second lithium composite oxide particles is larger than an average particle size of the first lithium composite oxide particles. The second lithium composite oxide particles have a porosity of 0.9% to 4.0%.

Abstract: Provided is a positive electrode that can provide a nonaqueous electrolyte secondary battery with high gas generation suppressing performance during storage and high cycle characteristics. The positive electrode disclosed here includes a positive electrode current collector and a positive electrode active material layer supported by the positive electrode current collector. The positive electrode active material layer includes monoparticulate first Ni-containing lithium composite oxide particles and secondary particulate second Ni-containing lithium composite oxide particles. The first Ni-containing lithium composite oxide particles and the second Ni-containing lithium composite oxide particles have layered crystal structures. The first Ni-containing lithium composite oxide particles have an average particle size (D50) of 2 ?m to 6 ?m. The second Ni-containing lithium composite oxide particles have an average primary particle size of 1.2 ?m to 2.0 ?m.

Abstract: Provided is a positive electrode active material that can provide a nonaqueous electrolyte secondary battery with high gas generation suppressing performance during storage and high output characteristics. The positive electrode active material includes monoparticulate first lithium composite oxide particles and secondary particulate second lithium composite oxide particles. The first and second lithium composite oxide particles contain Ni and have layered crystal structures. A median particle size D250 of the second lithium composite oxide particles is larger than a median particle size D150 of the first lithium composite oxide particles. An average primary particle size d1 of the first lithium composite oxide particles obtained by scanning electron microscope observation is less than 2.0 ?m. A ratio of the average primary particle size d1 of the first lithium composite oxide particles to the median particle size D150 of the first lithium composite oxide particles is 0.45 to 0.60.

Abstract: The present nonaqueous electrolyte secondary battery positive electrode comprises a positive electrode core, and a positive electrode composite material layer formed on the surface of the positive electrode core. The positive electrode composite material layer includes at least a positive electrode active material, and lithium phosphate. The positive electrode active material includes a first positive electrode active material wherein the Ni content relative to the total molar amount of metal elements other than Li is 50-65 mol%, and a second positive electrode active material wherein the Ni content relative to the total molar amount of metal elements other than Li is 45 mol% or less. The ratio of the first positive electrode active material to the second positive electrode active material in the positive electrode composite material layer is, by mass ratio, from 80:20 to 50:50.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. In number-based particle size distribution, the positive electrode active material has a first peak and a second peak. The first peak has a first vertex. The second peak has a second vertex. The first vertex is located on a smaller particle size side from the second vertex. The first peak is attributed to first particles. The second peak is attributed to second particles. The first particles include aggregated primary particles and films. Each film is adhered to a surface of each primary particle. The film includes a metallic element. Relationships of expression (I) “R=C/D” and expression (II) “1.54?R?1.75” are satisfied. In the expression (I), C [ppm] represents a mass fraction of the metallic element relative to the first particles, and D [?] represents a crystallite size of the first particles.

Abstract: It is an object of the present invention to provide a nonaqueous electrolyte secondary battery improved in output after storage in a charged state. An embodiment of the present invention provides a nonaqueous electrolyte secondary battery including an electrode assembly having a structure in which a positive plate and a negative plate are stacked with a separator therebetween. The positive plate contains tungsten and a phosphate compound. The negative plate contains a graphitic carbon material as a negative electrode active material and a noncrystalline carbon material stuck on the surface thereof. The negative plate contains tungsten or a tungsten compound on the surface of the noncrystalline carbon material.

Abstract: It is an object of the present invention to provide a nonaqueous electrolyte secondary battery improved in output after storage in a charged state. An embodiment of the present invention provides a nonaqueous electrolyte secondary battery including an electrode assembly having a structure in which a positive plate and a negative plate are stacked with a separator therebetween. The positive plate contains tungsten and a phosphate compound. The negative plate contains a graphitic carbon material as a negative electrode active material and a noncrystalline carbon material stuck on the surface thereof. The negative plate contains tungsten or a tungsten compound on the surface of the noncrystalline carbon material.

Abstract: It is an object of the present invention to provide a nonaqueous electrolyte secondary battery improved not only in room-temperature output but also in low-temperature regeneration. A positive electrode plate contains a lithium transition metal oxide as a positive electrode active material. A mix of the positive electrode plate contains a tungsten oxide and a phosphate compound. A nonaqueous electrolyte contains a linear sulfonate. When both of the tungsten oxide and the phosphate compound are present near the positive electrode active material, the linear sulfonate forms a movable decomposition product by oxidative decomposition on a surface of a positive electrode without forming any coating and the decomposition product and the unreacted linear sulfonate are reductively decomposed on a surface of the negative electrode together and a low-resistance coating is thereby formed.

Abstract: A positive electrode including a positive electrode mixture layer containing a positive electrode active material represented by Li1.08Ni0.43Co0.26Mn0.24O2 having a layered structure, a negative electrode containing a negative electrode active material, a separator provided between the positive electrode and the negative electrode, and a nonaqueous electrolyte are included, in which a film composed of carbon black permeable to lithium ions is formed on a surface of the positive electrode active material, and the film contains lithium fluoride particles serving as metal halide particles.

Abstract: Provided is a positive electrode for a non-aqueous electrolyte secondary battery, with which the increase in DC resistance of a non-aqueous electrolyte secondary battery after cycles is suppressed. According to one aspect of the present invention, a positive electrode for a non-aqueous electrolyte secondary battery includes a lithium transition metal oxide that contains an element that belongs to group 6 of the periodic table and a boron-containing carbon material as a conductive agent. Examples of the element that belongs to group 6 of the periodic table include chromium, molybdenum, and tungsten. Among these, tungsten is preferable.

Abstract: An aspect of the invention resides in a nonaqueous electrolyte secondary battery (10) including a positive electrode (11), a negative electrode (12) and a nonaqueous electrolytic solution, the positive electrode including a positive electrode active material containing a lithium transition metal oxide having a rare earth compound attached on the surface, the nonaqueous electrolytic solution including an aromatic compound having an oxidative decomposition potential in the range of 4.2 to 5.0 V vs. Li/Li+. The rare earth compound is preferably a rare earth hydroxide, a rare earth oxyhydroxide or a rare earth oxide.

Abstract: [Object] To provide a nonaqueous electrolyte secondary battery having excellent output characteristics and excellent thermal stability. [Solution] A positive electrode including a positive electrode mixture layer containing a positive electrode active material represented by Li1.08Ni0.43Co0.26Mn0.24O2 having a layered structure, a negative electrode containing a negative electrode active material, a separator provided between the positive electrode and the negative electrode, and a nonaqueous electrolyte are included, in which a film composed of carbon black permeable to lithium ions is formed on a surface of the positive electrode active material, and the film contains lithium fluoride particles serving as metal halide particles.

Abstract: The object is to provide a nonaqueous electrolyte secondary battery which can improve performance (increase in capacity) and reduce cost by improvement in heat stability. There are provided a positive electrode including a metal halide and a positive electrode active material containing a lithium transition metal oxide which includes nickel and manganese, a negative electrode including a negative electrode active material, and a nonaqueous electrolyte including a nonaqueous solvent, a fluorine-containing lithium salt, and a lithium salt which includes an oxalate complex as an anion.